<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h2>用户登录</h2>
    <form action="xxx">
        用户名:<input type="text" name="username"><br>
        密  码:<input type="password" name="password"><br>
        <input type="submit" value="点我登录">
    </form>
<input type="button" onclick="alert(1)" value="点我弹1">
</body>
</html>
